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New software will often require new firmware. New software packages always come with the latest firmware at the time the software was released; however, sometimes newer firmware is available.

There are two families of firmware; one for the heads, or STM-103 boards, and another for the motion controllers, or STM-427 / STM-407 boards.

Print Head / Hot Bed Firmware

For the STM-103 Boards. Consult the table below for the proper version. The wrong version WILL NOT WORK.

Video instructions for flashing the 103 (HH/HB) Controllers:

  1. Launch Repetrel ( C:\Repetrel\bin\Repetrel.exe ).
  2. Go to File > Update Firmware > HotHead Controller (even for HotBeds).
  3. Navigate to the proper .hex file for your machine from the table below.
  4. Connect the ST-Link as shown in the video above.
  5. Click "Program" - the process takes a few seconds.
  6. You are done.
Firmware Listing
Karl doesn't like me renaming these files, so...
Filament Heads Firmware
MK1-250 MK1_2_PRTDClearWires_1A.hex
MK1-250 with red RTDs (from 2013, 2014) _FIL_250_RED_235A.hex
MK2-250 MK1_2_PRTDClearWires_1A.hex
MK1-450 MK450_Caution_450C_45A.hex
Emulsion-Type Heads Firmware
All Emulsion-type Heads (including mixing heads) Emo_Vol_Kra_Cod.50V.hex
Laser Heads Firmware
Diode Lasers on Repetrel v2.x Laser_Diode_Shark_6N.hex
Diode and CO2 Lasers on Repetrel v3.x LaserPWM_8L.hex
Spindle Tools Firmware
Spindle Tools, Three-Phase 3phase_Spindle_238M.hex
Spindle Tools, Single-Phase DrillMill_236M_DC_SPINDLE.hex
Inkjet Heads Firmware
Inkjet Headss (Heat- and Piezo- based) LaserPWM_8L.hex

Print Head / Hot Bed Values

Let's not confuse flashing a version of firmware on a head with flashing new default values to a head. I know - I didn't come up with the terms.

Once your head has the proper firmware version running on it, you want to be sure that the values for the head are correct. Please consult the pages for Cold and Warm Flow and Hot Flow for our recommended values, then adjust for your custom environment as needed, determined through trial and observation.

To change the values, click on the arrow at the top right (next page) or the temperature display area at the top left (previous page) of the displayed data for that head. Edit values as appropriate, and then on the last page, RIGHT-CLICK on the Flash button and then confirm that you want to overwrite the previous defaults with these values, then click Yes on the confirmation dialog box.

Headdata mk1-250.png

For our purposes, the hotbed and a printhead are controlled in the same manner.

V2 vs V3

Why is my head FLASHING RED?

Non-Hydra units shipping through spring 2017 ship with Repetrel version 2.x. Hydra units, and other units shipping as of summer 2017 will have version 3.x, and should consult the version 3.x tables, below. All units should be upgraded to 3.x when it is available. If you run a head with v2 settings on a v3 install, the background will FLASH RED; please make the changes for each head and right-click-flash these values on your heads:

  1. For Cold and Warm Flow (EMO, SDS, VOL, KRA, TAM, etc).
  2. For Hot flow (MK*).
  3. For the HotBed Controller, just define it as a print head, set the pulses to 10, redefine it as a hotbed, and flash these settings. Contact us for help.

Motion Controller Firmware

For the STM-429 and STM-407 Boards.

Video instructions for flashing the 407 and 429 (Motion) Controllers:

Note that all units shipped since 2015 are internally cabled to automatically connect for flashing, so there should be no need to remove the rear cover or connect special cables.

  1. Launch Repetrel ( C:\Repetrel\bin\Repetrel.exe ).
  2. Go to File > Update Firmware > Motion Controller
  3. Select the latest .dfu file for your machine from the table above.
  4. Your printer should show as "CONNECTED" in the firmware utility. If it is not:
    1. Access the Motion Controller.
    2. Change the vertical switch to BOOT CONFIG (away from the vertical switch).
    3. Reset the motion controller (small button left of the LED).
    4. You should now be CONNECTED.
  5. Click "Program" - the process takes a few seconds.
  6. IF you had to change the switch, change it back and reset the motion controller.
  7. You are done.
Firmware Listing
Printer Model Repetrel Version Firmware
All Hydra Models (3-, 4- and 5- axis) Repetrel 3.082_x Hydra 3.082_x
Engine, High Resolution Repetrel 3.082_x Hydra 3.082_x
System 30M (and earlier Systems) Repetrel 3.082_x Hyrel 3.082_x
Repetrel 2.865 Version 2.414
Engine, Standard Resolution Repetrel 3.082_x Hyrel 3.082_x
Repetrel 2.865 Version 2.414

Motion Controller Values

Let's not confuse flashing a version of firmware on the motion controller with flashing new default values to the motion controller - again, not my terms.

We should always be sure that we're running not only with the correct version of the motion controller firmware, but that the values for the present model of equipment are being used. In Repetrel, under Settings > Printer, a dialog box will open with lots of numbers you may want to play with. Please don't change any values unless you're sure that they will do something that you want. We have default files for each model, and some users will want to save custom settings - like different park positions for different beds, or different maximum print speeds and acceleration parameters for more heavily outfitted yoke assemblies.

There is a utility to read and write configuration files on every PC running Repetrel v3 at C:\repetrel\Printer Settings, and you should run on (or at least start with) the configuration file for your model printer.

Please resist the urge to go tampering here without talking to us. There's probably a better way to achieve your desired end results.